melanism

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melanosis

 [mel″ah-no´sis]
1. disordered melanin production, with darkening of the skin; called also melanism.
2. a disorder of pigment metabolism.
melanosis co´li brown-black discoloration of the mucosa of the colon.
melanosis i´ridis (melanosis of the iris) abnormal pigmentation of the iris by infiltration of melanoblasts.

mel·a·nism

(mel'ă-nizm),
Unusually marked, diffuse, melanin pigmentation of body hair and skin (usually not affecting the iris).
See also: melanosis.

melanism

(mĕl′ə-nĭz′əm)
n.
1. See melanosis.
2. Dark coloration of the skin, hair, fur, or feathers because of a high concentration of melanin.

mel′a·nis′tic adj.

mel·a·nism

(mel'ă-nizm)
Unusually marked, diffuse melanin pigmentation of body hair and skin (usually not affecting the iris).
See also: melanosis

melanism

a condition in which excessive production of MELANIN produces unusual dark colour or blackness in scales, skin or plumage. see INDUSTRIAL MELANISM.
References in periodicals archive ?
Here, we reported on a new male phenotype in mangrove rivulus fish, with the diagnostic features being the absence of a melanistic fingerprint on the caudal fin typical of hermaphrodites, retention of the ocellus on the caudal peduncle, the lack of orange coloration on the body that is typical of males, and relatively small body size.
In the assessment, it was found out that there were differences between doses (0.4, 0.6, 0.8 ml/L) regarding the total induction time of both melanistic and not melanistic groups (p<0.05).
As with other native populations in an urbanized habitat (e.g., Gustafson and VanDruff, 1990), the majority (~75%) of eastern gray squirrels found on our campus and in the residential area of Hiram Village have melanistic pelage.
1936) and frequency assessments of "melanistic" hamsters in presumably dimorphic populations (Gershenson 1945).
Seventeen stuffed melanistic pheasants limply hang upside down from the spindly lower branches.
The melanistic phase is completely black, the silver phase (highly prized for its fur) has black fur with white tips, and the cross phase is red with black across the shoulders.
I haven't detected any cognates in western Barito, but Nathanael gives kuleh for Barito Mahakam's Tunjung, where it is said to refer to the melanistic color variant of the animal.
" In Karnataka, Dandeli- Anshi appears to be the hotspot for this melanistic form.
However, if adaptation largely explains variation in cell size across habitats, then saying that small plants have small vessels because they have small fusiform cambial initials is akin to saying "after the advent of the Industrial Revolution, melanistic Biston betularia showed dark coloration due to a significant increase in the productions of dark pigmentation" rather than giving an explanation involving selection favoring dark mutants on sooty trunks.
Some jaguars are black (melanistic), and seem to be more common in eastern and south-eastern regions (Sierra de Imataca and along the border with Guyana) than in the central and western parts of the country.
On 29 December 2000 at 0830 h, we observed three juveniles (two gray and one melanistic) coming out of a leaf nest in a pine tree.